Apparatus for electrical treatment of gases



A. A. SCHMIDT.

APPARATUS FOR ELECTRICAL TREATMENT 0F GASES.

APPLICATION FILED OCT. 3.191?.

` Patent-@.1 .my s, 1919.l

CALIFORNIA.

'v ARTHUR. A. SCHMIDT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO INTERNATIONAL PRECIPITATION COMPANY, LOS ANGELES, CALIFORNIA, A CORPORATION OF i i i APPARATUS FOR. ELECTRICAL fr nEA'vtlJMEN'J:I oF GASES.

To dll whom it may concern.'

Be it known that I, ARTHUR A. SCHMIDT, a citizen of *the United States, residing at Los Angeles, inthe county o-f Los Angeles and State of California, have inventedl a new and useful Apparatus for Electrical Treat-- ment of Gases, ofwhich -the following is a specification.

T his invention relates particularly to an apparatus for separating suspended materrial from gases by electrical action, although which are so constructed and maintained at such potential difference asto cause the suspended material to be `precipitated or collected, Wholly or in part, on certain of the electrodes, which are called collecting or receiving electrodes. In the operation of such apparatus it is sometimes desirable to supply water or other liquid to the gases, or to the precipitated material, or to the surfaces of the collecting electrodes. Such addition of water or other liquid 'may be for the purpose of humidifying the gas so as to control the electrical or chemical actions tak ing `place therein, or for thepurpose of cool` ing the gas or-the electrodes, or for the pur-i pose ofwetting or moistening the "deposit on the electrodes, or for the purpose of washing away such deposit,.or a portion thereof.

The main object of `the present invention y is to provide means for supplying water or other-'liquid for the abo-ve, or other purposes, in an apparatus of the kind, in such man- `ner that the water or other liquidbw'ill be uniformly and effectively distributed on to the surfaces of the electrodes on which the suspended material is received or collected.

The accompanying drawings illustrateI embodiments of my invention, and referring thereto:I i`

Figure 1 is a Vertical section of-an electrical precipitator comprising a tubular elec trode pro-vided with water supply means according to my invention.

Fig. 2 is a section on line 2-2 in Fig. 1.

Fig.r3 is a vertical section of another form ofthe invention, f

Fig. 4 is a section on line 4-4 in Fig. 3.

Specification of Letters Patent.

PatentedJuly 8, 1919.

Application led October 3, 1917. Serial No. 194,615.

Fig. 5 is a horizontal section of another formof my invention.

The electrical precipitator shown in Figs. 1 and 2 comprises a tubular receiving electrode 1 and a discharge electrode 2 mounted therein. Casing 1 is shown as a vertical tube or pipe, connected at its lower end to a chamber or header 3, which receives the gas to be treated from an inlet flue 4. Any number of tubular receiving electrodes 1 may be mounted on said header 3, and said tubular electrode or electrodes maybe open at their upper ends, as shown, or may be connected to an upper header for carrying away the treated gases. The construction shown is adapted to pass the gas upwardly through the treater, but if desired, the tubular electrode orelectrodes 1 may be connect-ed to suitable gas conduits in such manner as to cause the gas to pass downwardly through the precipitator.

The discharge electrode 2, consisting, for example, of aline wire, may be mounted on suitable insulating supports 5 and may be -connected by wire 6 to suitable means for applying high tension current thereto-for example, as shown in patent to F. G. Cottrell, No. 895,729, August 11, 1908, the receiving electrode 1 being preferably ground- -ed asv indicated at 6, and the source of high tension current heilig connected to complete the circuit through a ground connection.

n The tubular receiving` electrode 1 is provided with supply means for liquid, consisting of annular troughs 8v surrounding the #said electrode and having supply pipe connections 9 for water,y solution, or other liquid, perforations 1() beinr provided in the wall of said tubular electrode to permit such liquid to iow from the troughs through the re- Aceiving electrode from the outside thereof to .diference is lmaintained between the discharge electrode 2 .and'thetubular receiving v between the latter and-an outerl casingj15,

electrode l, in such manner as to subject the gas passing through said tubular receiving' velectrode to the actlon of an electricall field,

and to cause the material'to be suspended in Ithe" gas to be 'precipitated' on the receiving electrode, or more properly, on the ilm or stream' of liquid on such electrode. The

stream of liquid is preferalbly of sufficient- "volume to continually carry away, the material so precipitated and the resulting pulp `well known in the art.

As shown in Figs. Band 4, thelwallofthe,y

tubular electrode, indicated at 13, may be formed of porous material, such as unglazed terra cotta, 1 or 'equivalent material of any" kind, and water, solution or other, liquid` may be suppliedfrom a'chamber 14 surrounding said tubular electrode and formed said chamber 14 having a supply pipe 16 for water or other liquid. Headers or inlet'and outlet chambers 17 and 18 are` provided at the top and bottom of the tubular'electrode,

' the lower header beingV provided with discharge gate 19l forl precipitated material,

such material being either drained into said i chamber from the. electrodelS, or flushed thereinto whenrequired. -Suitably supported and insulated discharge electrode means v 20 is also provided, extending axially in the tubular 'electrode-13, and connected to a source/of current, as abovedescribed. The

operation of this formof' my invention isy Substantially the same as in the case of the form shown vin Figs. 1 and 2, it being noted 'that the lilm of waterf or ,solution on the Vtu- 'n bular electrode 13 furnishes the requisite conductance for the current, incase said electrode is made ofpoorly conducting material, 'such as terra cotta pipe.

-. Any desired number of the porous walled I tember 1917.

tubular receivingelectrodeslz may be arranged iwithin a single outer casing, so that a single chamber supplies liquid toall of-said electrodes, and said electrodes" may be of any suitable shape', for example, ,as shown at 25 Jin Fig. 5, they' may be rectangular in cross section and may 'be inclosed within anl outer -casing26, the space..27 within said casing and around and between said collecting electrodes 25 constituting the liquid supply consist of wires or strips hung in rows within the respective electrodes 25 and supported i and insulated inv any suitable manner. What I claim is:

1. In apparatus for precipitating suspend-I ed particles from gases by electrical action, a

porous electrode, and water supply means for supplyingwater from the outside of said electrode through said porous electrode to Kthe inner surface thereofl 2. In apparatus for electrical precipitation of suspended particles from gases, a dischargeelectrode, a collecting electrode opposite said discharge electrode and having perforations distributed atl different parts thereof, and means for supplying water to such lperforations so that such water is supplied through the electrode from the out- -side thereof to the inner surface thereof.

3. In an apparatus for electrical precipitation of suspended particles from gases; a discharge electrode, a tubular porous collecting electrode 'surrounding said discharge` electrode, and alcasing surroundingsaid collecting electrode ald'forming a water receiving chamber between said collecting electrode and-'said casing.

' 4. In an apparatus for electricalprecipita- .tion of suspended particles -froinl gases, 'a plurality of tubular porous collecting .elec-,"-

trodes, a' casing surroundin ysuch plurality of collecting electrodes` and orming a water 'recelving cham'beraround saidelectrodes,

and discharge electrodes extending within the respective collecting electrodes.

In testimony whereof I have hereunto subscribed' my :name this 25th day of Sep- ARTHUR A. scHMiDT.

60 chamber. The discharge electrodes may v 

